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University of Calif ornia Puhlicafions in Zoology [Vol. 20 



The feeding habits of Trichonympha are similar to those described 

 above for Leidyopsis. A change in the shape of the body occurs 

 but is not so striking as in Leidyopsis. The posterior portion only 

 partakes in this change, often losing its elongate rounded form and 

 becoming wider, giving to the flagellate a bell-shape with the lower 

 margin considerably swollen. The long flagella on the posterior 

 portion of the differentiated ectoplasm extend backward with their 

 tips interlacing in the ordinary form. When the lower part of the 



Figs. 12-14. Trichonymi>ha sp., drawn from living specimens, showing various 

 stages in the ingesting of food bodies. Xote short clear pseudopods in figure 12 

 and the long one in figure 13. X 200. 



bell becomes wider they do not form such a close covering of the 

 posterior portion and food particles may be more easily swept into 

 contact with the hungry ectoplasm of that region. The same result 

 is obtained when the posterior portion becomes drawn out beyond 

 the tips of the flagella. It seems probable that this latter is the 

 usual form that the flagellate assumes when actively feeding. In 

 many individuals the posterior portion of the body containing food 

 bodies occupies about one-third to one-fourth the entire length of 

 the body (figs. 12, 13). Individuals may show these proportions 

 reversed. One flagellate was measured which was 560/* in length 

 and only 140/* from the anterior tip to the posterior margin of the 

 nucleus. The remaining portion was literally filled with food 

 particles. 



